Reference : Spectroscopic and photometric variability of the O9.5Vp star HD93521
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/2908
Spectroscopic and photometric variability of the O9.5Vp star HD93521
English
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
De Becker, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
van Winckel, Hans [K.U. Leuven > Instituut voor Sterrenkunde >]
Aerts, Conny [K.U. Leuven > Instituut voor Sterrenkunde >]
Eenens, Philippe [Universidad de Guanajuato (Mexico) > Departamento de Astronomia >]
Lefever, Karolien [K.U. Leuven > Instituut voor Sterrenkunde >]
Vandenbussche, Bart [K.U. Leuven > Instituut voor Sterrenkunde >]
Linder, Natacha mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
2008
Astronomy and Astrophysics
EDP Sciences
487
2
659-670
Yes (verified by ORBi)
International
0004-6361
Les Ulis
France
[en] stars: early-type ; stars: individual: HD 93521 ; stars: oscillations
[fr] stars: rotation
[en] Aims. The line profile variability and photometric variability of the O9.5Vp star HD93521 are examined in order to establish the properties of the non-radial pulsations in this star. Methods. Fourier techniques are used to characterize the modulations of the He I lambda lambda 5876, 6678 and H alpha lines in several spectroscopic time series and to search for variations in a photometric time series. Results. Our spectroscopic data confirm the existence of two periods of 1.75 and 2.89 h. The line profiles, especially those affected by emission wings, exhibit also modulations on longer time scales, but these are epoch-dependent and change from line to line. Unlike previous claims, we find no unambiguous signature of the rotational period in our data, nor of a third pulsation period (corresponding to a frequency of 2.66 d(-1)). Conclusions. HD93521 very likely exhibits non-radial pulsations with periods of 1.75 and 2.89 h with l similar or equal to 8 +/- 1 and l similar or equal to 4 +/- 1 respectively. No significant signal is found in the first harmonics of these two periods. The 2.89 h mode is seen at all epochs and in all lines investigated, while the visibility of the 1.75 h mode is clearly epoch-dependent. Whilst light variations are detected, their connection to these periodicities is not straightforward.
Researchers ; Professionals
http://hdl.handle.net/2268/2908
10.1051/0004-6361:200810002
http://arxiv.org/abs/0806.3640

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